Rachid Ibtiouen

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This paper deals with fault diagnosis of induction machines based on the discrete wavelet transform. By using the wavelet decomposition, the information on the health of a system can be extracted from a signal over a wide range of frequencies. This analysis is performed in both time and frequency domains. The Daubechies wavelet is selected for the analysis(More)
This paper presents the steps of the approach to identify the linear parameters of a salient-pole synchronous machine at standstill and by frequency response tests data (SSFR). It is currently established and demonstrated that stability parameters for synchronous machines can be obtained by performing frequency response tests with the machine at standstill.(More)
The paper examines the dynamic performances of a three-phase self-excited induction generator (SEIG) during sudden connection of static loads. A dynamic flux model of the SEIG in the ˺-˻ axis stationary reference frame is presented. The main flux saturation effect in the SEIG is accounted for by using an accurate technique. The cases of purely resistive,(More)
—This paper deals with the prediction of magnetic field distribution and electromagnetic performances of parallel double excitation and spoke-type permanent magnet (PM) motors using simplified (SM) and exact (EM) analytical models. The simplified analytical model corresponds to a simplified geometry of the studied machines where the rotor and stator(More)
This paper presents , the stator current minimization in an induction machine controlled by the oriented flux method. This minimization is realized by two different methods, a dynamic programming and the optimization in permanent operating regime. Flux in the machine is no more constant as it is the case in the conventional vectorial control, but it evolves(More)
The rotor circuit time constant is an important parameter for indirect field oriented control. Incorrect estimation of the rotor time constant also leads to incorrect flux angle calculations and can cause significant performance deterioration if no means for compensation or identification is applied. The magnetic saturation, the operating temperature and(More)
The main goal of this paper is to develop a method permitting to determine the nature of the rotor defects thanks to the spectral analysis. The development growing that the equipment of measurement (spectral analyzer) and the software of digital signal processing had made possible the diagnosis of the electric machine defects. Motor current signature(More)
In this paper a method of detection of broken bars in squirrel cage induction machine is presented. This method is based on the determination of discrete parameters of the transfer functions of the induction machine by model structures such as ARMAX, ARX, IV and OE model structures
This paper presents a general analytical subdomain model for the computation of magnetic field distribution in any number of stator slots and rotor poles with and without electrically-excited, permanent magnet-excited and hybrid-excited multiphase flux switching machines (FSM) topologies. The goal of this work is to elaborate an analytical general method(More)
—This paper deals with the magnet pole shape design for the minimization of cogging torque in permanent magnet synchronous machines (PMSM). New shapes of permanent magnet are proposed. The magnet shape is modeled analytically by a set of stacked and well dimensioned layers relatively to the height and opening angle. The final shape of magnet is configured(More)